EP1355764B1 - Luftfederschlagwerk mit kurz bauendem antriebskolben - Google Patents
Luftfederschlagwerk mit kurz bauendem antriebskolben Download PDFInfo
- Publication number
- EP1355764B1 EP1355764B1 EP02712875A EP02712875A EP1355764B1 EP 1355764 B1 EP1355764 B1 EP 1355764B1 EP 02712875 A EP02712875 A EP 02712875A EP 02712875 A EP02712875 A EP 02712875A EP 1355764 B1 EP1355764 B1 EP 1355764B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- striking
- guide sleeve
- pneumatic spring
- striking mechanism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/04—Portable percussive tools with electromotor or other motor drive in which the tool bit or anvil is hit by an impulse member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/12—Means for driving the impulse member comprising a crank mechanism
- B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D9/04—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously of the hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member
Definitions
- the invention relates to an air spring impact mechanism for a shock and / or Rotary hammer according to the preamble of claim 1.
- Air spring impact values are known from DE-A-19 828 426.
- the percussion takes relatively little space and is inexpensive to produce.
- the percussion piston reaches one high impact speed.
- Particularly advantageous is the reliable Start-up behavior of the impact mechanism from idling.
- the invention is therefore based on the object, while maintaining the positive Features of the striking mechanism further reduce the idling to achieve occurring vibrations.
- the percussion piston In normal impact mode, the percussion piston is therefore still at least axially movable with a part in the guide sleeve of the drive piston.
- the operator raises the shock and / or Hammer drill together with the tool to be machined Rocks, causing the tool shank to slide out of the hammer.
- the percussion piston has the opportunity to do likewise continue to move forward, in the direction of impact and glides out of the Guide sleeve out. Ideally, it moves completely out the front end of the guide sleeve and is only through the Impact housing held. This will clear the cavity Impact piston and drive piston open, so that during further movement of the drive piston air in the air spring enclosing cavity penetrate and suck back the percussion piston and subsequent Can prevent blows.
- a reliable idling behavior is the Episode.
- the axial Length of the guide sleeve of the drive piston smaller than a maximum Axialweg the percussion piston between its extreme positions.
- the axial The length of the guide sleeve must be dimensioned such that the Impact piston in impact operation reliably in the guide sleeve hinund can be moved; in idle mode, however, the percussion piston must completely slip out of the guide sleeve.
- the recording allows the construction of a negative pressure to hold the Impact piston, as will be explained later.
- the movement of the percussion piston can be performed in various ways. It is particularly advantageous if the percussion piston in both idle as well as in impact operation exclusively by the impact mechanism housing, z. B. with his piston shaft, is performed. This may be so be exploited that in impact mode, so when the piston head of the percussion piston is located in the guide sleeve of the drive piston, the Guide sleeve is guided by the percussion piston, but not by the impact mechanism housing. In this way, you can get unwanted duplicates be avoided, which could occur when both the guide sleeve as well as the percussion piston each guided in the percussion mechanism housing would. A guide of the piston head of the percussion piston in idle mode is not necessary with sufficient guidance of the piston skirt. Accordingly, the above-described recording for the Piston head in Schlagtechniksgephaseuse be sufficiently large, to avoid tolerance problems.
- the air spring can be ventilated in idle mode via the front end of the guide sleeve and Relaxable, wherein the guide sleeve no further idling openings to ventilate the air spring in idling mode.
- the guide sleeve no further idling openings to ventilate the air spring in idling mode.
- the percussion piston is completely made the guide sleeve emerges and thus the front side of the guide sleeve is exposed, Additional idling openings are not required.
- the omission of idling openings has the consequence that the manufacturing cost of the drive piston decrease and the susceptibility to cracking or breakage due to omission the otherwise caused by the idling openings notch effect reduced becomes. Furthermore, not least because of the shorter length of Drive piston reduce tolerance problems.
- At least one air compensation slot in the guide sleeve is provided, which has an axial length, the larger as the axial length of the piston head of the percussion piston. Leave it Air losses of the air spring, which occurred during the impact generation always balance again when the piston head is at height the air compensation slot is located. Then that means a short one Moment the air spring behind the piston head with the environment in front of the Piston head in connection. If at this time the drive piston already in its return movement and thus a suction effect on the percussion piston, is due to the negative pressure in the air spring additional air in the cavity between the drive piston and percussion piston sucked.
- the air balancing slot allows the guide sleeve can be performed with minimal wall thickness.
- a further advantageous embodiment of the invention is that on the recording, the piston head in idle mode in the percussion gear housing holds, a one-way valve is provided, one between the intake, the front cavity formed with the piston head and the piston skirt the environment of the percussion, z. B. connects a crank chamber of the hammer.
- a one-way valve is provided, one between the intake, the front cavity formed with the piston head and the piston skirt the environment of the percussion, z. B. connects a crank chamber of the hammer.
- the percussion piston from a piston head and a different one from it by its geometrical dimensions Piston shaft consists. Rather, the piston head and the Piston shaft of the percussion piston in another embodiment of the invention also have a substantially same diameter.
- FIG. 1 shows a schematic section through an inventive air spring impact mechanism, the Z. B. in a hammer and / or hammer drill Use comes.
- Figs. 2 and 3 show the same air spring impact mechanism, however with different positions of the moving pistons.
- a drive piston 1 is connected via a rotationally driven crankshaft. 2 and a connecting rod 3 is set in an oscillating axial movement.
- the drive piston 1 consists essentially of a guide sleeve 4 and a Guide sleeve 4 on a rear end final piston crown 5.
- the connecting rod 3 is pivotable in a known Way connected.
- the drive piston 1 is with its guide sleeve 4 in a percussion tube 6 axially movable.
- the percussion tube 6 is part of a percussion gear housing.
- a percussion piston 7 is shown in Fig. 1, the essentially consists of a piston head 8 and a piston shaft 9, wherein the piston head 8 is movable in the interior of the guide sleeve 4.
- the piston shaft 9 is in a belonging to the percussion housing housing tube 10 led.
- the drive piston 1 and the percussion piston 7 means that the percussion piston 7 with his piston shaft 9 is guided in the housing tube 10 and in turn via the piston head 8, the guide sleeve 4 of the drive piston 1 leads.
- a cavity 11 is enclosed, in which an air spring is formed, when the drive piston 1 is reciprocated.
- the air spring is the oscillating movement of the drive piston 1 on the percussion piston. 7 which retraces the movement and retraces with the drive piston 1 facing away, front end of the piston skirt 9 on a not shown shank of a tool, also not shown, or can strike on a striker, not shown, in a known manner. 1 shows the percussion piston 7 in its impact position, ie in the position, in which he hits the tool shank or striker.
- FIG. 1 shows just a part of an air compensation slot 12, which extends in the guide sleeve 4 with an axial length, the larger is, as the axial length of the piston head 8.
- the axial length of the air compensation slot 12 can be better seen in Fig. 3, where the air equalization slot 12 is not covered by the piston head 8. Thereby it is possible that the air spring in the cavity 11 via the air equalization slot 12 with a cavity 13 in front of the percussion piston 7 briefly in connection stands.
- Fig. 3 shows the position of the percussion piston 7, when the Luftfedertschtechnik idle mode.
- the idle mode adjusts itself when the operator lifts the tool off the rock to be worked. Thereby Slips the tool shank and possibly the striker something out of the Housing of the hammer out, causing the percussion piston 7 in a position can reach, which is still before the impact position shown in Fig. 1, namely in the idle position shown in Fig. 3.
- the percussion piston 7 slides with its piston head 8 out of the guide sleeve 4 and enters a percussion gear housing associated recording 16, in which he in the shown in Fig. 3 Idle position is held.
- the drive piston 1 in turn leads due the continuous rotational movement of the crankshaft 2 its back and forth Moving away.
- the provision of the receptacle 16 is not mandatory required. In a variant of the invention not shown is none Receiving 16 provided so that the percussion piston 7 after exiting the guide sleeve 4 is guided exclusively on its shaft.
- Air can penetrate through the openings 14 in the interior of the guide sleeve 4 or - in a forward movement of the drive piston 1 - also flow out again, so that in the cavity 11 of the guide sleeve 4 no Can form air spring.
- the operator sets the tool on the rock to be worked on, which is the tool shaft and if necessary, the striker displaced into the interior of the housing of the hammer and the percussion piston 7 pushes out of the receptacle 16 until he Covering the front side of the guide sleeve 4 and introduced into the guide sleeve 4. Since the cavity 11 in the guide sleeve 4 characterized by the environment completed, an air spring can build up again very quickly, whereby the impact operation is continued.
- the openings 17 connect the space 13 (front Cavity) in front of the piston head 8 through openings 19 and the air channels 15 with the environment.
- the rubber ring 18 is located above the openings 17th It becomes somewhat in the event of pressure build-up in the front cavity 13 lifted so that the air from the front cavity 13 through the openings 17 and the openings 19 can escape to the environment (at a pressure build-up by the forward movement of the percussion piston 7). Of the Impact piston 7 thereby has the ability to completely into the receptacle 16th penetrate.
- the receptacle 16 it is not necessary that the receptacle 16 the piston head 8 in the in The manner shown in the figures closely or annularly encloses. As above executed, in a variant of the invention, the receptacle 16th completely missing. Alternatively, the annular portion of the receptacle 16 a have sufficient distance to the piston head 8 to the risk of To avoid double adjustments. It should be noted that the Percussion piston 7 with its piston shaft 9 is already sufficiently performed.
- a percussion piston comes 7 used, the piston head 8 with a larger diameter and a piston skirt 9 has a smaller diameter.
- the basic principle the invention namely the escape of the percussion piston from the guide sleeve of the drive piston and the associated short design
- the drive piston can also be used in other shaped percussion piston apply.
- the percussion piston only off consists of a piston head, or that of the piston head and the piston shaft have substantially the same diameter.
- the drive piston not - as in the above described embodiment - is made in one piece, but composed of different components. So it may be z. B. for be further reduction of the mass of the drive piston, the Guide sleeve made of steel, the piston crown, however, made of plastic or to produce another lightweight material.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Percussive Tools And Related Accessories (AREA)
Description
- Fig. 1
- einen schematischen Teilschnitt durch ein erfindungsgemäßes Luftfederschlagwerk, mit einem Schlagkolben in Schlagstellung;
- Fig. 2
- einen Teilschnitt des Luftfederschlagwerks, mit dem Schlagkolben in hinterster Stellung; und
- Fig. 3
- einen Teilschnitt des Luftfederschlagwerks mit dem Schlagkolben in Leerlaufstellung.
Claims (11)
- Luftfederschlagwerk für einen Schlag- und/oder Bohrhammer, miteinem in einem Schlagwerksgehäuse (6) axial hin- und herbewegbaren Antriebskolben (1) mit einer im Wesentlichen hohlzylindrischen Führungshülse (4) und einem die Führungshülse (4) tragenden Kolbenboden (5):einem axial hin- und herbewegbaren Schlagkolben (7) mit einem Kolbenkopf (8) und einem Kolbenschaft (9); und miteinem zwischen dem Antriebskolben (1) und dem Schlagkolben (7) ausbildbaren und in einem Schlagbetrieb eine Luftfeder umschließenden Hohlraum (11):in dem Schlagbetrieb der Schlagkolben (7) wenigstens teilweise in der Führungshülse (4) des Antriebskolbens (1) axial bewegbar ist:
- Luftfederschlagwerk nach Anspruch 1, dadurch gekennzeichnet, dass im Leerlaufbetrieb der Schlagkolben (7) nicht durch die Führungshülse (4), sondern im Wesentlichen durch einen feststehenden Teil des Schlagwerksgehäuses (10, 16) axial geführt und gehalten wird.
- Luftfederschlagwerk nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Schlagkolben (7) im Schlagbetrieb mit seinem Kolbenkopf (8) wenigstens teilweise in der Führungshülse (4) des Antriebskolbens (1) axial bewegbar ist.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die axiale Länge der Führungshülse (4) kleiner als ein maximaler Axialweg des Schlagkolbens (7) zwischen seinen Extremstellungen ist.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass im Leerlaufbetrieb und/oder im Schlagbetrieb der Schlagkolben (7) ausschließlich an seinem Kolbenschaft (9) oder an seinem Kolbenschaft (9) und an seinem Kolbenkopf (8) axial geführt wird.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass in dem Schlagwerksgehäuse eine Aufnahme (16) für den Kolbenkopf (8) des Schlagkolbens (7) im Leerlaufbetrieb vorgesehen ist.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Luftfeder im Leerlaufbetrieb über das vordere Ende der Führungshülse (4) belüftbar und entspannbar ist, und die Führungshülse (4) keine weiteren Leerlauföffnungen zum Belüften der Luftfeder im Leerlaufbetrieb aufweist.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass in der Führungshülse (4) wenigstens ein Luftausgleichsschlitz (12) vorgesehen ist, der eine axiale Länge aufweist, die größer als die axiale Länge des Kolbenkopfs (8) des Schlagkolbens (7) ist.
- Luftfederschlagwerk nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass ein durch die Aufnahme (16), den Kolbenkopf (8) und den Kolbenschaft (9) gebildeter vorderer Hohlraum (13) über ein Einwegventil (17, 18) mit der Umgebung koppelbar ist.
- Luftfederschlagwerk nach Anspruch 9, dadurch gekennzeichnet, dass das Einwegventil einen wenigstens eine Öffnung (17) zu dem vorderen Hohlraum (13) abdeckenden, radial vorgespannten, elastischen Ring (18) aufweist.
- Luftfederschlagwerk nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass der Kolbenkopf (8) und der Kolbenschaft (9) des Schlagkolbens (7) den gleichen Durchmesser aufweisen.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10103996A DE10103996C1 (de) | 2001-01-30 | 2001-01-30 | Luftfederschlagwerk für einen Schlag- und/oder Bohrhammer mit kurz bauendem Antriebskolben |
DE10103996 | 2001-01-30 | ||
PCT/EP2002/000963 WO2002060652A1 (de) | 2001-01-30 | 2002-01-30 | Luftfederschlagwerk mit kurz bauendem antriebskolben |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1355764A1 EP1355764A1 (de) | 2003-10-29 |
EP1355764B1 true EP1355764B1 (de) | 2004-06-02 |
Family
ID=7672135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02712875A Expired - Lifetime EP1355764B1 (de) | 2001-01-30 | 2002-01-30 | Luftfederschlagwerk mit kurz bauendem antriebskolben |
Country Status (6)
Country | Link |
---|---|
US (1) | US6808026B2 (de) |
EP (1) | EP1355764B1 (de) |
JP (1) | JP4027321B2 (de) |
DE (2) | DE10103996C1 (de) |
ES (1) | ES2218515T3 (de) |
WO (1) | WO2002060652A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10333799B3 (de) * | 2003-07-24 | 2005-02-17 | Wacker Construction Equipment Ag | Hohlkolbenschlagwerk mit Luftausgleichs- und Leerlauföffnung |
DE102005019711A1 (de) * | 2005-04-28 | 2006-11-09 | Robert Bosch Gmbh | Handwerkzeugmaschinenschlagwerkeinheit |
JP2008012665A (ja) | 2006-07-01 | 2008-01-24 | Black & Decker Inc | 舗装破砕機用工具ホルダー |
EP1872910B1 (de) | 2006-07-01 | 2012-11-21 | Black & Decker, Inc. | Verfahren zum Bemessen die Abnutzung eines nasenartigen Teils eines Döppers in einem Bohrhammer |
EP1872909A3 (de) * | 2006-07-01 | 2010-05-05 | Black & Decker, Inc. | Werkzeughalterverbindungssystem für einen Abbruchhammer |
US7413026B2 (en) * | 2006-07-01 | 2008-08-19 | Black & Decker Inc. | Lubricant system for powered hammer |
JP2008012660A (ja) * | 2006-07-01 | 2008-01-24 | Black & Decker Inc | 舗装破砕機 |
DE102007000827A1 (de) | 2007-10-08 | 2009-04-09 | Hilti Aktiengesellschaft | Handwerkzeugmaschine mit einem Kurbelgetriebe |
DE102012210088A1 (de) * | 2012-06-15 | 2013-12-19 | Hilti Aktiengesellschaft | Werkzeugmaschine |
US9416593B2 (en) | 2012-12-28 | 2016-08-16 | Smith International, Inc. | Piston strike face and bit interface for percussion hammer drill |
EP3000560A1 (de) * | 2014-09-25 | 2016-03-30 | HILTI Aktiengesellschaft | Eintreibgerät mit Gasfeder |
WO2019079560A1 (en) | 2017-10-20 | 2019-04-25 | Milwaukee Electric Tool Corporation | PERCUSSION TOOL |
WO2019147919A1 (en) | 2018-01-26 | 2019-08-01 | Milwaukee Electric Tool Corporation | Percussion tool |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2844086A1 (de) * | 1978-10-10 | 1980-04-30 | Bosch Gmbh Robert | Handwerkzeugmaschine, insbesondere schlaghammer |
GB2084917A (en) | 1980-10-08 | 1982-04-21 | Kango Electric Hammers Ltd | Improvements in or relating to percussive tools |
DE4239294A1 (de) * | 1992-11-23 | 1994-05-26 | Black & Decker Inc | Bohrhammer mit pneumatischem Schlagwerk |
JP3292969B2 (ja) * | 1995-08-18 | 2002-06-17 | 株式会社マキタ | ハンマードリル |
JP3450558B2 (ja) * | 1995-12-25 | 2003-09-29 | 株式会社マキタ | 電動工具 |
DE19714287A1 (de) * | 1997-04-07 | 1998-10-08 | Hilti Ag | Bohr- und/oder Meisselgerät |
DE19728729C2 (de) * | 1997-07-04 | 2000-11-09 | Wacker Werke Kg | Luftfeder-Schlagwerk mit Luftausgleich |
DE19828426C2 (de) * | 1998-06-25 | 2003-04-03 | Wacker Werke Kg | Antriebskolben mit geringer Wandstärke für ein Luftfederschlagwerk |
DE19843642B4 (de) * | 1998-09-23 | 2004-03-25 | Wacker Construction Equipment Ag | Luftfederschlagwerk mit Rückholluftfeder |
DE19847687C2 (de) * | 1998-10-15 | 2001-05-23 | Wacker Werke Kg | Hohlkolben-Schlagwerk mit Hülsensteuerung |
DE19851888C1 (de) * | 1998-11-11 | 2000-07-13 | Metabowerke Kg | Bohrhammer |
DE19929183B4 (de) * | 1999-06-25 | 2004-07-29 | Wacker Construction Equipment Ag | Luftfederschlagwerk mit Hohl-Schlagkolben mit Leerlauföffnung |
-
2001
- 2001-01-30 DE DE10103996A patent/DE10103996C1/de not_active Expired - Fee Related
-
2002
- 2002-01-30 ES ES02712875T patent/ES2218515T3/es not_active Expired - Lifetime
- 2002-01-30 EP EP02712875A patent/EP1355764B1/de not_active Expired - Lifetime
- 2002-01-30 DE DE50200502T patent/DE50200502D1/de not_active Expired - Lifetime
- 2002-01-30 US US10/466,019 patent/US6808026B2/en not_active Expired - Lifetime
- 2002-01-30 JP JP2003583079A patent/JP4027321B2/ja not_active Expired - Fee Related
- 2002-01-30 WO PCT/EP2002/000963 patent/WO2002060652A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
WO2002060652A1 (de) | 2002-08-08 |
DE10103996C1 (de) | 2002-10-02 |
DE50200502D1 (de) | 2004-07-08 |
EP1355764A1 (de) | 2003-10-29 |
JP2005519781A (ja) | 2005-07-07 |
US6808026B2 (en) | 2004-10-26 |
US20040065454A1 (en) | 2004-04-08 |
ES2218515T3 (es) | 2004-11-16 |
JP4027321B2 (ja) | 2007-12-26 |
WO2002060652A8 (de) | 2002-09-06 |
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